STFT Bank to Bank Imbalance

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    Matthew Trefethen
    Matthew Trefethen

    I have a recently built ford coyote V8. I am experiencing a bank to bank imbalance with my short term fuel trims only at 1100 rpms. Long terms remain at 0 and hqve no codes. At idle STFT are normal and are also normal at all other rpms and at WOT. Only at 1100 rpms cruising bank 2 is normal, but bank 2 is anywhere from 23 to 30% positive (lean).

    I have smoke tested the intake and cannot find any leaks. Did a compression and leak down amd everything is perfect there. O2s are cycling normal.

    I cannot think of what to check next. Please help.

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